高分子發光二極體(Polymer Light Emitting Diode, PLED)始於1990年英國劍橋大學Friend等人的研究，發現共軛高分子可做為發光二極體材料，從此開啟了高分子發光二極體的時代。
　　聚芴( Polyfluorene)，且熱安定、化學穩定性均不錯，且具有很高的螢光量子效率(Fluorescence Quantum Efficience)，螢光放射波長涵蓋在400～460 nm(藍光)，很適合作為發藍光的結構。但是Polyfluorene光學穩定性不佳，如容易有激發雙體、凝集的現象產生，大大限制其應用性。Polyfluorene的另一個缺點，就是其HOMO能階太低，當以ITO電極為陽極時，電洞注入不易。本研究即致力於改善這些現象。
　　Carbazole分子，亦是發藍光的材料，其衍生化合物，因為熱穩定性好，且具有電洞傳遞層和發光層的特性，所以也被廣泛用於PLED上。本研究利用Suzuki Reaction，將Fluorene分子與Carbazole分子聚合成一系列的高分子。導入Carbazole基團之後，可以提高高分子的HOMO能階，使電洞注入較容易。另外，因為反應的位置是Fluorene分子2,7位置與Carbazole分子3,6位置，所以反應後會造成近乎90度的彎曲結構。由於這個特殊的結構，在光激發光時，可以改善高分子的光學熱穩定性。但是在電激發光時，高分子依然會有Excimer的現象，而使發光光色隨驅動電壓而改變。
　　Fluorene與Carbazole的9號位置常常被利用來接上不同的側鏈，以改善其溶解度或其他性質，本研究亦分別接上長碳鏈、三級氨基和四級氨基為側基，來觀察其溶解度的變化與其他性質的變化。
本研究另一個方向，是將高分子與鈉蒙脫土摻混，利用蒙脫土特殊的層狀結構，使高分子與其形成插層型奈米複合材料，用以探討高分子於奈米環境中的發光性質。發現高分子之光激發光性質，在摻混前後性質改變不大，但是在電激發光時，卻能改善高分子凝集的現象，使其在不同驅動電壓下的發光光色較穩定。

　　Since the discovery of electroluminescence(EL) in the poly(1,4-phenyl-enevinylene) (PPV) in 1990, EL conjugated polymers have attracted much interest in recent years because of their potential application in large-area flat panel displays.
　　In the past decade, fluorene-based conjugated polymers (PFs) have emerged as a very promising class of blue-light emitting materials for use in PLEDs because of their high photoluminescence (PL) and electro- luminescence quantum efficiencies, thermal stability, good solubility, and facile functionalization at the C-9 position of fluorene. However, the application of polyfluorenes in PLEDs has been hampered because of the troublesome formation of a tailed emission band at long wavelengths during device fabrication and operation, leading to both color instability and reduced efficiency.
　　In this study, we prepared a series of alternating fluorene/carbazole copolymers and systematically investigated the influences of the carbazole content on photophysical, electrochemical, and electroluminescent properties of the resulting polymers. Cyclic voltammetric studies have shown that the HOMO energy levels of copolymers can be raised by inducing the carbazole content. The copolymers exhibited stable PL spectra independent of annealing. However, their EL spectra showed significant red-shift with increasing operating voltage.
　　The polymers were also intercalated into　montmorillonite to investigate their physical, electrochemical, and optical properties. We found the nano- composites’s PL spectra are nearly the same as their corresponding polymers. However, annealing of the nanocomposite leads to appearance of new red-shifted peak, which is attributable to excimer formation. The nanocomposite of polyfluorene and montmorillonite shows more voltage- independent EL spectra when fabricated as ITO/PEDOT/Polyfluorene/Al device.

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